Lexical error - installp

Hey guys,
Have you seen an error like the one below? The server is running AIX 5.1 ML4.
And this error occurred while trying deinstall the older version of Sudo. (1.6.7p5)
lppchk -v
lppchk: A lexical error occurred for eb3988ab2b816e27fcb3039c388585f4 0.0.0.0
on line 1, column 15.
There is an illegal number: 284823d.
Use local problem reporting procedures.
lppchk: The following filesets need to be installed or corrected to bring
the system to a consistent state:
eb3988ab2b816e27fcb3039c388585f4 0.0.0.0 (UNKNOWN)